The United States, Japan, and South Korea have advanced their trilateral technology partnership in 2026 well beyond traditional defense and intelligence cooperation into economic security, supply chain resilience, and coordinated approaches to artificial intelligence and semiconductor development – areas where the three countries’ combined industrial capabilities represent a formidable complement to the US-led effort to maintain technological leadership relative to China. The technology dimensions of the relationship were elevated to a formal trilateral coordination level at the 2023 Camp David summit, and subsequent leadership changes in all three countries have maintained and deepened the institutional arrangements that summit created. The trilateral techno-alliance has evolved into a platform for coordinating export controls on advanced technology, aligning investment screening mechanisms to prevent Chinese acquisition of sensitive technology, and supporting resilient semiconductor supply chains less vulnerable to single-point disruptions.

Japan and South Korea’s combined position in the global semiconductor ecosystem is extraordinary: Samsung Electronics and SK Hynix dominate global DRAM and NAND flash memory, while Tokyo Electron, Shin-Etsu Chemical, Sumco, and JSR supply critical equipment and materials for chip manufacturing worldwide. Coordinating the three governments’ export controls for advanced semiconductor technology – particularly the equipment for the most advanced manufacturing nodes that China is seeking to develop domestically – allows the trilateral partners to maintain a more comprehensive technology barrier than any individual country could manage alone. The Pentagon’s blacklisting of 188 Chinese companies including semiconductor-related entities in June 2026 is one component of this broader strategy to limit China’s access to the technology inputs needed for world-class chip manufacturing. South Korea’s simultaneous pursuit of full China ties restoration through Lee’s Beijing visit illustrates the tension Seoul navigates between the trilateral technology containment framework and its economic dependence on China as its largest export market.